package com.dcy.facade;

/**
 * @Author：dcy
 * @Description:
 * @Date: 2021/1/22 10:32
 */
public class Stereo {
    private static Stereo screen = new Stereo();

    private Stereo() {

    }

    public static Stereo getInstance() {
        return screen;
    }

    public void on() {
        System.out.println(" screen on");
    }

    public void off() {
        System.out.println(" screen off");
    }

    public void up() {
        System.out.println(" screen up");
    }
}
